there could be a new predator/prey type such as a snake that could live in different biomes and be different danger levels. It would be called Fangper or something such as this. In the jungle it would be venomous and potentially poisonous, like if your creature collected the meat there would be a chance that they could take damage from the poison. In the savanna it would just injure the creature if the snake bit it. And the way to kill it would be to sneak up behind the snake with +3 attack to guarantee a kill, attacking from the front will give a chance for your creature to be bit. Also if a snake gets to close to a nest with a newborn baby in it or a baby out of the nest there could be a chance the snake could attempt to eat the baby. The snakes will give +4 to +7 food depending on the snake/island type. The snakes could also attempt to kill the Rabbels (i think thats it) on the island. You would have to be careful around snake dens because they could look very similar to a Rabbel den. And maybe if you killed/attacked a certain amount of snakes then you could unlock snake/lizard genes, like a head, a tail, and lizard claws/paws.